const fs = require('fs')
function foo() {
  function f1() {
    var read1 = fs.createReadStream(__dirname + '/递名片事件列表.xlsx')
    read1.on('data', function (data) {
      console.log('第一个文件读取字节%d', data.byteLength);
    })
  }
  process.nextTick(f1)
}
var read2 = fs.createReadStream(__dirname + '/递名片事件列表.xlsx')
read2.on('data', function (data) {
  console.log('第二个文件读取字节%d', data.byteLength);

})

foo()